in a certain country, that the proportions of" no change audits" (that is audits that uncover no additional taxes are due) has risen over the years and currently approximately .26. Suppose that a random sample is taken of 100 audits.
A) What is the probability that the sample has between 24% and 27% no-change audits?
B) What is the probability that the sample has between 20% and 30% no- change audits?
C) What is the probability that the sample has more than 30% no-change audits?
in a certain country, that the proportions of" no change audits" (that is audits that uncover...
6. Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with a mean equals 271 days and σ=26 days. Part (a): About 35% of the pregnancies period are between 285 and x days. Find x. Part (b): What is the probability that a random sample of 36 pregnancies has a mean gestation period of 268 days or less? Part (c): What is the probability that a random sample of 49 pregnancies has a mean gestation...
Suppose that over a certain period, the percent change in the daily adjusted close of the S&P500 can be approximately modeled as a normal random variable with mean 0.04% and standard deviation 0.92%. a) What is the probability that on a randomly selected day the change is between -1.3% and +1.7%? b) On how many of 100 randomly selected days in this period would a change above +2.0% would be expected? c) What is the 85th percentile of this variable?...
A survey found that 24% of consumers from a Country A are more likely to buy stock in a company based in Country A, or shop at its stores if it is making an effort to publicly talk about how it is becoming more sustainable. Suppose you select a sample of 100 respondents from Country A. Complete parts (a) through (d) below. a. What is the probability that in the sample, fewer than 24% are more likely to buy stock...
The shape of the distribution of the time required to get an oil change at a 10-minute oil-change facility is unknown. However, records indicate that the mean time is 11.2 minutes, and the standard deviation is 3.7 minutes. Complete parts (a) through (c). (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? O A. The normal model cannot be used if the shape of the distribution is unknown. OB. Any sample...
In a certain country tthe probability a randomly selected adult is literate is 0.84. Suppose we draw a simple random sample of 13 adults from this country. a) What is the probability exactly 11 are literate? Round your response to at least 3 decimal places b) What is the probability more than 11 are literate? Round your response to at least 3 decimal places.
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In a certain country tthe probability a randomly selected adult is literate is 0.89. Suppose we draw a simple random sample of 11 adults from this country. a) What is the probability exactly 9 are literate? Round your response to at least 3 decimal places. Number b) What is the probability more than 9 are literate? Round your response to at least 3 decimal places. Number
The probability of a randomly selected adult in one country being infected with a certain virus was 0.004. In tests for the virus, blood samples from 27 people are combined. What is the probability that the combined sample tests positive for the virus? Is it unlikely for such a combined sample to test positive? Note that the combined sample tests positive if at least one person has the virus. The probability that the combined sample will test positive is?
The probability of a randomly selected adult in one country being infected with a certain virus was 0.004. In tests for the virus, blood samples from 27 people are combined. What is the probability that the combined sample tests positive for the virus? Is it unlikely for such a combined sample to test positive? Note that the combined sample tests positive if at least one person has the virus. The probability that the combined sample will test positive is?
The shape of the distribution of the time required to get an oil change at a 20-minute oil-change facility is unknown. However, records indicate that the mean time is 21.4 minutes, and the standard deviation is 4.1 minutes. Complete parts (a) through (c).(a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required?A. Any sample size could be used.B. The sample size needs to be less than or equal to 30 .C. The...
The shape of the distribution of the time required to get an ail change at a 10-minute oil-change facility is skewed right. However, records indicate that the mean time is 11.3 minutes, and the standard deviation is 3.1 minutes. Complete parts (a) through (c). (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? A. The normal model cannot be used if the shape of the distribution is skewed right. B. Any sample size could...